Safety attachment for burners.



No. 883,784. PATENTED APR. 7, 1908.

w. A. CALDWELL, JR.

SAFETY ATTACHMENT FOR BURNERS.

APPIiIO-ATION FILED JUNE 28. 1907.

- ZI7. Z..

WITNESSES INVENTOH ATTORNEYS NITED sTA Es PeQTENT -()FFICE:-

WIL IAM A. CALDWELL, 11s., or ROSWELL, TERRITORY on NEW' MEXICO.

SAFETY ATTACHMENT Foe Burma as.

Specification of Letters Patent.

- Patented Apri1'7, 1908.

Application filed June'ZB, 1907. Serial No. 381,242.

To all whom it mo concern:

Be it known hat I, WILLIAM A-T CALD- WELL, Jr., a citizen of the United States,- and a resident of Roswell, in the county of Chaves and Territory of New Mexico, have invented a new andlm roved Safety Attachment for sim-ple,- inexpensive' and efficient safety attaohment forburners, which prevents .the escape of gas or other fuel to the burner unless the fuel is ignited A further object-of the invention is to provide a device of the class described, having means controlled by the heat of the burner for operating a fuel inlet valve, ancL-further, having means for igniting the fuel burner I from-a oint remote from the burner.:

.A st' further objectof the invention is to rovide a safety attachment for burners, aving a fuel inlet valve controlled by the expansion and contraction ofQa thermally sensitive substance, whereby the escape of the fuel to the burner-is revented when the fuel is not i 'ited, and larly controfiiid by the expansion. and contraction of a thermallysensitivev substance,

for'igniting the fuel at the burner from a point remote from the burner.

The invention consists in the construction and combination'of parts to be more fully described hereinafter and particularly set forth in the claims.

Reference is to be, had to the accompany- .ingdrawin'gs forming a part of this specification, in which similar characters of reference lndicate corresponding parts in all the views, and in which I Figure 1 is a side elevation of a burner. hav-- ing my invention a plied thereto and showing parts vertica section; Fig. 2"is an enlarged vertical section of a detail; and Fig. 3

. is an enlarged partially vertical section'of a further detail.

' are often asource of danger in that the flame atthe burner is accidentally extinguished.

Before proceeding .to a more detailed exglanation of my invention itshould be un- Y erstood that as burners, for instance, those in connection with stovesand lamps,

and subsequently the gas fuel escape'sfrom the burner, unignited, to fill the room with aving means s1miobviate this (1 anger 1 provide a safety attachment for as burners Which'prevents the es-.

cape of t 1e gaseous fuel from the burner.-

if the latter is unignited. For the urposc I employ-a thermally sensitive su stance which controls a movable member located in a casing, the movable member in turn servmg to o crate an inlet valve controlling the flow'oft 1e fuel into-the burner.

Will'be open, as the heat of the flames expands the substance in the chamben'forcmg the, movable membermto an o eratlvc position and. thereby opening the va ve and holding the same open againstthe tension of a 'spring'as' long as the substance remains ex panded. I use a similar device for igniting the fuel As long as the fuel isignited at the burner the valve at the burner from a point remote from the burner, a bulb filled with the thermally sensitive-substance controlling a valveadmitting fuel to an ignition tube adjacent to the bulb. From the ignition chamber a flame conveyer leads to the burner; thus, when a burning match or other source 9f .heat is applied tothe ignition ibulb, the expansion of the substance in the latterpcrmits the flow of fuel to the ignition tube, the fuel being there ignited and the flame running along the flame conveyer to the chamber of the.

burner, heatingthe latter. The expansion ofthe thermally sensitivesubstance therewithin, opens the valve and permits fuel to flowinto the burner, and the flame, heating the chamber, immediately-igmtes the fuel.

'VVhen the match or other source of heat is withdrawn from the i nition bulb, the substance therewithin 000 s and the flow of fuel to the ignition tube ceases. As soon as the burningfuel at. the burner is extinguished, the chamber and. the thermally sensitivesubstance therewithin cool and the flow of fuel to the burner is thereupon immediately stepped.

eferring inore particularly to the drawvings, 1 represents a' stove, having the usual top 2'and sides 3. A burner 4 which may be within the stove and is mounted at the end of an upwardly disposed arm .5 of the fuel I of any preferred or common type, is arranged be manually o er-ated to control the flow of the gaseous uel through the -pipc. The

' sleeve 11, ureter-ably rounded and closed at burner 4 has'openings 8 to permit the flame from the burning fuel to escape and has further openings 9 through which'air can be drawn in by the inrush of the gas to make a suitable burning mixture of air and gas. The

valve 7 has the usual hand-wheel l'O at the side oi" the stove.

Arranged centrally within the burner 18 a the end a( jacent to the top of the burner. The sleeve 11 is carried by a threadeddisk or plug 12, located in the correspondingly threailed end of the arm 5 of the fuel pipe. The sleeve 11, near the upper end has open lugs 13 at the sides, and, the plug 12 has openings 14 thcrethrough, ell'ecting'comnn1- nicaiion between the fuel pipe and the interior of the sleeve, to permit the low of fuel 'i'ro n the pipe through the openings 14,

' openings therethrough.

thence into the sleeve 11, and thence through the openings 13 to the burner.

\Vithin the sleeve 11] is a bulb 15 preferably fitting snugly withinthe roundedend of the sleeve. At the lower end, the bulb 15 has an elongated integral casing 16 the lower end ol which fits in a suitable 'openin near the middle oi the plug 12. A movable member" head 22' normally closing the openingthrough the partition 20. 'A helical spring 23 is IIIOUIlt-Gt u on the rod 19 between-the i partitions 21 am the'movable member, nor

mally holding, the latter in the normal position with the head of the rod 19 closing theop'ening through the )artition 20. The proecting endi'of the ro( 19 has a valve disk 24, eld in position by a nut 25. The v'alvedisk 24 is laterally extended, and closes the openings' l t-when the member -17 and rod 19 are in the normal position, when the fuelis re.-

vented from flowing into the burner. 1thin the bulb 1.5 is a thermallysensitive substance 26 such as mercury, completelyfilling the bulblat ordinary temperatures. When the bulb is heated thesubstance, expands, and passing through the opening in' the .partiti-on 2O forces themovable member longitudinally of the casing 1,6 against the tension of'the spring 23, thereby 0 enin the valve and errnittmg-thefuel to o'w'trou h the T us as; long as the iuelis ignited atthe burner, the

openings Hand 13 to the burner.

The corres omlin l ormed P conveyor an expanded liquid within the bulb holds the va ve-open and permits the continued flow of the fuel.

Mounted upon the fuel pipe 6 at a point adjacent to a wall of the stove is a bracket 27, constituting at one end a casing 28 having opposite lateral openings 29. Around the openings 29 the bracket 27 has annular flan es 130, at one of which is mounted a tube 31 e ectin communication between the fuel pipe and the casing 28 through said opening 29. At the opposite opening 29 the flange 30 carries a flame-conve ing tube 32, having a longitudinal slot 33. The flame-conveying tube 32 runs to the burner and passes through a suitable opening 34 in the side of the latter, and has the end disposed adjacent to an o ening near the bulb 15. o

A bu b 35"having an elongated neck 36, is carried at the end oi" the bracket 27 and has a movable member 37 slidablyarrange'd Within the neck. A rod 38 is secured to the mov able member 37, and extends throu ha suitable opening in a partition 39 intot e casing 28, within 'which it is secured to a valve plunger 40. A helical s )ring 41 is arranged upon the rod 38 and holr s the movable memher, the rod and the valve plunger in a normal position, the'latter closingthe openings 29 and preventing the'fiow of fuel to the flame conve'yer. An ignition tube 42', having a slot 43' and at the end a plurality of openings 44, is arranged adjacent to the bulb 35 and communicates at the inner end with the flame-conveyor .32. The bulb 35 is filled with a thermally sensitive substance 95, such as mercury. When the bulb is heated bythe application of a burning match or other source of heat, the expansionvof the substance therewithin forces the movable member 37 longitudinally of the neck, a ainstthe tension of the spring, thereby disp acing'the valve plunger 40 and uncovering theopenings 29, to .permit the flow of fuel fromgthepipe 6 throu h the tube 31 into the flame- (F the ignition tube. The source of heat ignites the gas within the ignition tu be, and the flame passes through the latter into the flame-conveyor running along the latter to the end thereof, the air being supplied for the combustion throughthe slots 43 and 33. The flame burning at the end of'the flame-'conveyer heats the bulb 15, and as exlained before, opens the ,valve to permitthe 1 I w of the fuel from the ipe 6 into the burner, where it is ignitedy the flame at the end of the-flame-conveyer, When the' source of'heat is withdrawn from the bulb 45, "the cooling thereof permits the substance to. contract and the spring 41 thereupon closes the openings 29. A door-.46 at the side ofthe stove gives access to the ignition device. i It will be understood that my attachment may be constructed of any suitable material,

and contraction of said su for instance, cast-iron. I refer to fashion the -bulbs of suitable nic eled metal, the in abIe' member in said neck and controlled by valve-disk of rubber, leather orthe like and the springs of steel.v The device is a lica- He not only-to gas burners, but to al urners using a gaseous mixture, for instance, mixtures of gasolene vapor and air.

Having thus described my invention, I

Patent 1. In a device of the class described, a

hollowbody having at the .end a chamber,

said chamber containing a thermally sensitive substance, a movable member within saidchamber and operable b the expansion hstance, a fuel inlet, said member having a valve controlling said fuel inlet, said body having a partition adjacent ,to said chamber, and resilient means arranged between said member and said partition for resisting the movement of said-member in a direction to open said fuel 2. In a a cylinder part forming ach-amber, said chamber coninlet, said bod having a partition adj ac'ent taining a thermally sensitive substance, a. movable member within said cylinder and operable by the expansion and contraction of said substance, a fuel inlet, said member having a valve disk controlling said fuel to said cham er, and a spring arranged between said member and said partition and resisting the movement of said member in ainlet valve to said ignition tube belng con- 4 presenting openings, a bulb wit in said sleeve and containinga, thermally sensitive substance, said bulb having a casing, a

through said plug effectin movable member Within'said casing, a rod rigid with said movable member, openings communication between said inlet and sai sleeve, said rod having a valvedisli for closin said 0 enings of said. plug, and a spring Witiu'n sai casing holding said member in a normal position to close said openings by means of saidvalve disk, said member being 0 erable by the expansion-and contraction 0 said substance.

4, In a device of the class described, a chamber containing a thermally sensitive substance and having a neck, a movable member in said neckcontrolled by the expansion and contraction of said. substance,

' inlet valve closedi an ignition tube adjacent to said chamber, a flameconveyin tube communicating with .said ignitiontu e, a fuel inlet valve to said ignition tube controlled by said member, and means-for normally holding said .fuel

. 5. In a vdev ice of the'class described, a

device of the class described, a hollow, elongated body formin I and having'at the end a latera-y extended bulb-having an elongated neck and containathermally sensitive substance, a movthe expansion and "contraction of said substance, an ignition tube adjacentto said bulb, aflame-conveying.) tube communicating with said ignition tu e, a fuel inlet valve communicating with said ignition tube through said flame-con-veyin tube, aplunger for closing said valve, sai plunger being controlled b' saidfmember, and means for normally ho ding said plunger in position-to close said valve.

, 6. In a device of the class described, a bulb having an elongated neckand containing a thermally sensitive substance, an ignition tube adjacent to said bulb and havinga longitudinal slit, a flame-conveying tube communicating with said ignition tube and having a longitudinalslit, afuel inlet valve communicating with said ignition tube through said flame-conveying tube, said flame-conveying tube-extending from said ignition tube to a burner, aplunger for closing said valve, a rod connecting said member and said plunger, and a spring within said neck and/engaging said member to hold said 7 plunger in position, closing said valve. 7. In adevice of the class described, a

chamber containing a thermally sensitive substance, a valve for controlling fuel, said valve being controlled-by said substance, a second chamber containing a thermally sensitive substance, an ignition tube, a flameconv'eying tube, and a valve'for controllin the fuel inlet to said ignition tube, said fuetrolled by said substance within said second chamber.

' 8. In a device of-the class described, a

chamber containing a thermally sensitive' substance, a movable member, a fuel inlet valve controlled b said member, said member being operab e by the expansion and contraction of said substance, a second let, said valve being controlled by said substance, a second chamber containin a th'er-,

mally sensitive substance, a movab e member controlled b the expansion and contrac-v tion ofsaid su stance--With1n'said secondchamber, an ignition tube adjacent to said,

second chamber, a'flame conveyin tube communicating withsaid ignition tu e and leading to said first chamber, a fuel inlet valve i l i i Wm to'said i nition tube controlled by said member, am 'means for normally holding said valve closed.

10. In a device of the classdescribed, a

chamber containing a-ther1nally sensitive substance, a movable member, a fuel inlet 'valve controlled b said member, said member being operab e by the expansion and -contraction of said substance, a second chamber containing a thermally sensitive substance and having a neck, a second movable member in said neck and controlled by the expansion and contraction of said substance within said second chamber, an ignition tube adjacent to said second chamber; a flame-conveying tube communicating with said ignition tube and leading to said first cl'laniber, a fuel inlet valve to said ignition tube and controlled by said second member, and means for normally holding said fuel inlet valve to said ignition tube, closed.

' 11. In a device of the class described, a chamber containing a therma ly sensitive substance, a casing communicating with said chamber; a movable member within said casing, an inlet valve controlled by said member, means for normally holdin said valve closed, saidmember being operable by the expansion and contraction of said substance, a second chamber /containing a thermally sensitive s'ubstaneeand having a neck,

a second movable member in said neck and operable by thefexpansmn and contraction said substance within said second chamber, an ignition tube adjacent to said second tube communichamber, a flame-conveying 1 e and eading to catin with said ignition tu said rst chamber, a fuel inlet valve to said r ignition tube and controlled by saidsecond member, and means for ionnallyfholding siliid fuel inlet valve to said ignition tube," c 0S8(l.;

12. In a dvice of the class described a 1 :5.

chamber containing a thermally sensitive w sai partition and resisting the movement of said member in a direction to open said fuel a spring arranged between said member and inlet, a bulb having an elongated neck and containing a thermally sensitive substance,

a movable member in said neck and con- 7.

trolled by the expansion and contraction of said substance wlthin said bulb, an ignition in tube communicating with said ignition tube ailjacent to said bulb, a' flame-conveyto e and leading to said chamber, a fuel inlet valve communicating with said ignition tube,

ger for closing said valve to said ignition tube, said longer being controlled by said memberwithin said neck, and means for normally holding said plunger in position to close said valve.

In testimony whereof I have signed my name to this specification in the presence of "two, subscribing witnesses. WILLIAM A. CALDWELL, JR. Witnesses: T

C. A. HAMILTON, g

0. C. CALDWELL- through said flame-conveying tube, a plun- 

